Game Boy
Games by Alpha: 'O'
| Obelix | --- | --- | --- | Board |
| Oddworld Adventures | FAQs | Codes | Reviews | Board |
| Oira Jajamaru! Sekai Daibouken | --- | --- | Reviews | Board |
| Olympic Summer Games | --- | --- | Reviews | Board |
| Olympic Summer Games: Atlanta 1996 | --- | --- | Reviews | Board |
| Oni II: Innin Densetsu | --- | --- | --- | Board |
| Oni III: Kuro no Hakaigami | --- | --- | --- | Board |
| Oni IV: Kishin no Ketsuzoku | --- | --- | --- | Board |
| Oni V: Innin no Tsugumono | --- | --- | --- | Board |
| Onigashima Pachinko-Ten | --- | --- | --- | Board |
| Operation C | FAQs | Codes | Reviews | Board |
| Osawagase! Penguin Boy | FAQs | Codes | Reviews | Board |
| Othello | FAQs | Codes | Reviews | Board |
| Othello World | --- | --- | --- | Board |
| Otogi Banashi Taisen | --- | --- | --- | Board |
| Out of Gas | --- | Codes | Reviews | Board |
| Outburst | --- | Codes | Reviews | Board |
| Oyatsu Quiz Mogumogu Q | --- | --- | --- | Board |
